Piston.



G, W. DAGGETT.

PlSTON.

APPLlcMloN FILED JULY 29,1915.

Patente?. Feb. f3()g 191?.

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UNITED STATES PATENT oFFioE.:

` GEORGE W. DAGGETT, O F NORTH GIRARD, PENNSYLITANIA.

PIs'roN.

Specification of Letters Patent.v

Aplication filed July 29, 19'15. Serial No. 42,591.

To all whom 'it may conce/m Be it known that I, GEORGE a citizen of theUnited States, residing at North Girard, in the county of Erie and Stateof Pennsylvania, have invented new and useful Improvements in Pistons, ofy

the piston desirable for usev in the engines of racing cars.l

With the above and other objects in view, the invention consists in the novel construction, combination and arrangement of parts7 as herein described, illustrated and claimed.

In the accompanying drawings Figure 1 is a diametrical section through a piston constructed in accordance withthe present invention. 1

y Fig. 2 is a diametrical section through the apron of the piston illustrating the first step in the method of manufacturing the piston. y

Fig. 3 is 'a similar view showing the second step of forming the holes for the piston pin. i

Fig. 4 is a similar view showing the'third step of pressing the metal inward to'proe vide for the bushings.

Fig. 5 is a similar view showing the bushings in place.

Fig. 6 is a diametrical section' through the piston head which is drop forged.

Fig. 7 shows the secondstep in the forma? tion of the piston head.

Fig. 8 shows the final step in the formation of the apron of the piston.4 f Fig. 9 is a mod ication of the form of piston head.

The piston is shown in its complete assembled form in Fig. 1 wherein 1 designates the apron or skirt of the piston which has a general hollow or tubular cylindrical form, 2 the piston head which israbbeted at 3 to receive the adjacent edge ofthe skirt or apron 1, 4 the bushings which are. 1n f serted through diametrica-lly opposite holes in the apron 1, and 5 the piston pin to the general way.

W. DAoGET'i," y

rIhe skirt or apron 14 of the pistonl is,

which the connecting formed lof stock tubing preferably of steel, the same being cut to a suitable length to form an apron or skirt of the desired lengthv as shown in Fig. 2. The next step consists Patented Feb. 2.o', .191m

rod is `attached in in forming the holes 6 at diametrically .op-

posite points in the apron to receiveV the bushings and piston pin. illustrated in Fig. -4 consists in pressing The neXt step inwardly the opposite portions of the apronadjacent tothe holes 6 to form inwardly vextending offsets 7 which reinforce thewalls of the piston immediately adjacent to and around the bushings 4 above referred to,

also leaving recesses o-r countersunk portlons 8 in which the heads of the bushingsv are received as shown in Fig. 5 wherein the next step n the method of production 1s shown to consist of inserting the bushings 4 so that the heads thereof lie flush with Aor slightly within the outerv'surface of the apron. -Finally, the inner edge of the apron is flanged inwardly as shown .at 9 to reinforce such edge of the piston.

The 4piston head 2- is made of a drop forging which produces the annular flange 10. The next step is shown` in Fig. 7 which consists in forming a rabbet 11 in the flange.

10 to receive the corresponding edge of the apron of the piston. When the parts have been formedin the manner described, the

bushings 4 are welded in. the inwardly pressed oifs'ets '7 of the apron and the latter is then associated with the annular rabbet 11 n-thel headv 2 and said parts welded together. l

By-means of the method hereinabove described, the piston is formed cheaply out of stock material and may be made lighter j than the ordinary cast iron piston. Furthermore, the wallofv the skirt o'r' apron is of uniform thickness and there can be no'flaws 'thereinwhich result from defecf' tive castings.v In this way the productis not onlylighter in weightbut. is materially stronger in 'its construction and more du# 'rable inoperation and has the same coeiicient of expansion as the cylinder itself,

thereby particularly adapting the completed piston for use in all engines vparticularly of theracing type.y f In the modification shown irr Flg'. 9, a

slight alteration is made over the forma.-

tion described in the preceding iigures, and,

` as illustrated, a strengthening web 15. de-

pends integrally from the head 2 and partially encircles the piston pin 5. Also formedin said head is a recess 16 designed to receive suitable piston rings 17 adapted to perform their usual functions.

Having thus described my' invention, I claim:-

l, An engine piston comprising a drop forged ,head having an annular flange formed with an annular rabbet in the outer face thereof, a tubular apron having one y having diametrically opposite points thereof compressed inwardly to form aperture'd offsets, and headed bushings inserted through said offsets and welded therein with the heads thereof lying flush with the outer surface of the apron.

ln testimony whereof l affix my signature in presence of two witnesses.

GEoEGE w. DAGGETT.

Witnesses:

HARRY L. DAGGETT, ELMER D. GETZ. 

